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What is the state of water when frost forms?

Answer and explanation

Correct answer: Solid

Correct answer: B, solid. Frost consists of ice crystals deposited on a cold surface. Water vapour in the air loses heat and changes directly into solid ice, or moisture freezes after reaching a sufficiently low temperature. In either case, the visible water in frost is solid. A is wrong because liquid water droplets on a surface are called dew, provided the temperature is not freezing. C describes water vapour, which is invisible and is the starting material before frost develops, not the final state seen as frost. D is wrong because plasma is an extremely energetic ionised state and is unrelated to ordinary atmospheric frost. The key comparison is simple: dew is liquid water, while frost is solid ice. Memory cue: frost feels hard and icy, so select solid.

Related tags

FrostSolid WaterIce CrystalsDew ComparisonForms Of Condensation: DewFogAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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